PREFIX : <http://example/>
PREFIX xsd:    <http://www.w3.org/2001/XMLSchema#>

SELECT ?v ?ebv {
  VALUES ?v { true 1 "a" false 0 "" "a"@en "z"^^xsd:boolean "2020-01-01T00:00:00Z"^^xsd:dateTime :a }
  BIND(!!?v AS ?ebv)
}